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  • Question

  • Refer to the given figures (a) and (b). A logic analyzer is used to check the circuit in figure (a) and displays the waveforms shown in figure (b). The actual analyzer display shows all four data outputs, Q0-Q3. The analyzer's cursor is placed at position X and all four of the data output lines show a LOW level output. What is wrong, if anything, with the circuit?

    Refer to the given figures (a) and (b). A logic analyzer is used to check the circuit in figure (a)


  • Options
  • A. Nothing is wrong, according to the display. The outputs are in the open state and should show zero output voltage.
  • B. The circuit is in the READ mode and the outputs, Q0-Q3, should reflect the contents of the memory at that address. The chip is defective; replace the chip.
  • C. The circuit is in the Refer to the given figures (a) and (b). A logic analyzer is used to check the circuit in figure (a) mode and should be writing the contents of the selected address to Q0?Q3.
  • D. The Q0?Q3 lines can be either LOW or HIGH, since the chip is in the tristate mode in which case their level is unpredictable.

  • Correct Answer
  • Nothing is wrong, according to the display. The outputs are in the open state and should show zero output voltage. 

    • More questions

    • 1. In HDL, LITERALS is/are:

    • Options
    • A. digital systems.
    • B. scalars.
    • C. binary coded decimals.
    • D. a numbering system.
      • Discuss
    • 2. Convert the following decimal number to hexadecimal.
      74

    • Options
    • A. A416
    • B. B416
    • C. 4A16
    • D. 4B16
      • Discuss
    • 3. Most modern digital systems are based on semiconductor technology.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The BCD equivalent of 73 is 01001001.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The stepper motor HDL will ignore its counter inputs and pass control inputs directly to the output when set in mode ________.

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
      • Discuss
    • 6. The CMOS uses bipolar transistors instead of MOSFET.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. In TTL the noise margin is between 0.8 V and 0.4 V.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A very critical dimension in project management is the time your boss will give you to complete the HDL project.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. The Boolean sum of the four product terms is called the sum-of-products.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. How many flip-flops are required to construct a decade counter?

    • Options
    • A. 10
    • B. 8
    • C. 5
    • D. 4
      • Discuss

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